CN111219314A - Refrigerant lubricated bearing arrangement - Google Patents

Refrigerant lubricated bearing arrangement Download PDF

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Publication number
CN111219314A
CN111219314A CN201911165596.XA CN201911165596A CN111219314A CN 111219314 A CN111219314 A CN 111219314A CN 201911165596 A CN201911165596 A CN 201911165596A CN 111219314 A CN111219314 A CN 111219314A
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CN
China
Prior art keywords
filter
refrigerant
unit
acid
desiccant
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Pending
Application number
CN201911165596.XA
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Chinese (zh)
Inventor
鲁道夫·豪列特纳
克里斯汀·马塔
基尔模·恩里克·莫拉莱斯·埃斯皮埃尔
汉斯·瓦林
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SKF AB
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SKF AB
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Publication of CN111219314A publication Critical patent/CN111219314A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/005—Compression machines, plants or systems with non-reversible cycle of the single unit type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C37/00—Cooling of bearings
    • F16C37/007—Cooling of bearings of rolling bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N39/00—Arrangements for conditioning of lubricants in the lubricating system
    • F16N39/06—Arrangements for conditioning of lubricants in the lubricating system by filtration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
    • F16N7/38—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated with a separate pump; Central lubrication systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/08—Pipe-line systems for liquids or viscous products
    • F17D1/14—Conveying liquids or viscous products by pumping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/003—Filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/02—Compression machines, plants or systems with non-reversible cycle with compressor of reciprocating-piston type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/16—Receivers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/16—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions

Abstract

A refrigerant lubricated bearing arrangement is disclosed comprising: a bearing assembly lubricated by a refrigerant; a refrigerant supply line for supplying refrigerant as lubricant to the bearing assembly, wherein upstream of the bearing assembly the refrigerant supply line further comprises at least one filter unit for filtering refrigerant.

Description

Refrigerant lubricated bearing arrangement
Technical Field
The present invention relates to a refrigerant lubricated bearing arrangement (bearing) according to the preamble of scheme 1.
Background
Bearings in compressors of cooling systems, for example in chillers or air conditioning systems, are typically lubricated by a refrigerant used in the cooling system itself. However, the refrigerant may contain harmful products, which may lead to corrosion or other damage to the bearings. The reason for this is that the refrigerants typically used in air conditioning chillers are not stable under all conditions. The molecules may decompose and produce byproduct compounds that are harmful to the cooler and bearings used in the cooler compressor. Decomposition may be caused by heat, pressure, or the presence of liquid contaminants that act as catalysts, or by the inherent chemical instability of the refrigerant. The most damaging byproducts are the highly corrosive acids, particularly hydrofluoric acid (HF) and hydrochloric acid (HCl). HF and HCl are formed from fluorine atoms and chlorine atoms contained in refrigerant molecules. Of particular interest are recently developed refrigerants, such as R1234ze, R1233zd, and R1234yf, that are formulated to decompose easily in the event they leak into the atmosphere, where they can potentially cause environmental problems.
Water is another liquid contaminant that may decompose and produce byproducts that may corrode or diffuse into the bearing assembly. The combination of water, HF, HCl and oxygen from entrained air is a very harmful mixture that can also cause severe damage to bearings. However, water itself is problematic because water lubrication is poor and may cause corrosion and hydrogen embrittlement of the steel components of the bearing (hydrogen embrittlement).
Disclosure of Invention
It is therefore an object of the present invention to provide the possibility to protect refrigerant lubricated bearings from the harmful effects of corrosion or other damaging by-products.
This object is solved by a refrigerant lubricated bearing arrangement according to scheme 1 and a cooling system according to scheme 9.
In the following, a refrigerant lubricated bearing arrangement is proposed, comprising: at least a bearing assembly lubricated by a refrigerant; a refrigerant supply line for supplying refrigerant as a lubricant to the bearing assembly.
In order to protect the bearings from harmful substances in the refrigerant, the following solutions have been proposed: upstream of the bearing assembly, the refrigerant supply line further comprises at least one filter unit for filtering the refrigerant. Such filters contain materials that adsorb and/or react with contaminants and/or byproducts such that the refrigerant used to lubricate the bearings is substantially free of harmful substances.
According to a preferred embodiment, the at least one filter unit comprises at least one of an acid filter, a desiccant filter and a particle filter. Thereby, particles, acids and/or water, which are the most harmful substances to the bearing, can be removed from the refrigerant, so that the bearing is protected from corrosion and other defects. Commercially available desiccant filters, such as those used to remove water, may also be used. It is further preferred to configure the filter(s) like kidney filter(s) to continuously filter the refrigerant in the cooling system. However, for refrigerant lubrication of the bearing assembly, it is preferred to arrange a filter in line upstream of the bearing assembly.
Preferably, the at least one filter unit is a combined filter unit having at least an acid filter and a desiccant filter for filtering acid and moisture from the refrigerant. The combination of filters located in, for example, one housing reduces the space required for additional filters. By combining the filter units and increasing the filter efficiency, a synergistic effect can be further exerted. Generally, water and acid are substances that compete for the adsorption of the filter material. By providing a combined filter, both water and acid can be removed equally and reliably. Additionally or alternatively, the filter element may be designed to have the same dimensions as the oil filter element or other filter element, and may be placed in a filter housing already present in the flow path of the refrigerant for bearing lubrication.
According to a further preferred embodiment, the at least one filter unit is a filter arrangement with a plurality of filter elements comprising a desiccant filter (desiccant filter), an acid filter (or a combination of an acid filter and a desiccant filter) and a particle filter (particulate filter), wherein the desiccant filter is arranged upstream of the acid filter and the particle filter and the desiccant filter or a combination of an acid filter and a desiccant filter is arranged upstream of the particle filter. The illustrated filter arrangement allows for optimized filtering of the refrigerant. For example, there are filters that provide very good adsorption of acids. However, in the presence of water, the adsorption performance of water and acid deteriorates due to their competitive binding to the filter material, which is used for hydrogen binding and has a higher affinity. As a result, removing water or moisture (/ humidity) from the refrigerant upstream of the acid filter allows for improved both water/moisture (/ humidity) filtration and acid filtration. Of course, it is also possible to arrange the particle filter upstream of the desiccant filter and the acid filter or the combination of desiccant and acid filter, or to arrange the filters in a still different order.
The filter unit itself is preferably adapted to adsorb, intercept or capture specific molecules from the refrigerant by chemisorption and/or physisorption, wherein the type of adsorption depends on the type of material and the surrounding composition. This means that when the adsorption is physical adsorption (Physisorption), the captured molecules maintain the same chemical structure and are adsorbed by hydrogen bonds or van der waals bonds. In this case, the interaction between the filter material and the surroundings is reversible. As a result, desorption may occur (i.e., cleaning of the filter), for example, by heating the filter material or when two molecules compete. On the other hand, when the adsorption is Chemisorption (Chemisorption), a chemical reaction between the filter material and the surrounding environmental molecules may occur, which may generate (in some cases) new products. In this case, the adsorption is strong and occurs through covalent, metallic or ionic bonds.
According to a further preferred embodiment, the filter unit comprises an acid filter for filtering hydrofluoric acid and/or hydrochloric acid from the refrigerant, wherein the filter material of the acid filter is made from alumina (Al)2O3) Silicon dioxide (SiO)2) Graphite oxide, graphene oxide, magnesium oxide (MgO), aluminosilicate (Al)2SiO5) And combinations thereof. These filter materials have proven effective for filtering hydrofluoric and/or hydrochloric acid.
In order to remove water and/or moisture from the refrigerant, it is advantageous to use a filter unit comprising a desiccant filter for filtering dissolved and/or free water from the refrigerant. Preferably, the filter material of the desiccant filter is selected from the group of zeolite scavenger adsorbents such as scolecite, natrolite, offretite, ferrierite or combinations thereof having various sizes and shapes for filtering dissolved water, graphene oxide and combinations thereof and polymers such as water absorbing filters (/ water adsorbing filters/water absorbing filters) for filtering free water. These types of filters are cost effective, commercially available and easy to operate.
According to a further preferred embodiment, the filter unit comprises a particle filter for filtering particles from the refrigerant, wherein preferably the filter material of the particle filter is a stainless steel mesh, a magnet for metal particles and/or a combination thereof.
Another aspect of the invention relates to a cooling system comprising a refrigerant circulation line for circulating refrigerant from at least one compressor unit for compressing gaseous refrigerant to a condenser unit for condensing gaseous refrigerant to liquid refrigerant, from the condenser unit to an optional expansion unit for expanding liquid refrigerant, from the condenser unit or optional expansion unit to an evaporator unit for evaporating liquid refrigerant to gaseous refrigerant, and from the evaporator unit back to the compressor unit, wherein the at least one compressor unit comprises a bearing arrangement as described above.
Therefore, preferably, the refrigerant supply line branches off from the refrigerant circulation line. This allows a simplified design of the compressor and does not require an additional lubrication reservoir.
Further preferred embodiments are defined in the dependent claims as well as in the description and the drawings. Thus, elements described or illustrated in combination with other elements may exist alone or in combination with other elements without departing from the scope of protection.
In the following, preferred embodiments of the invention are described with reference to the accompanying drawings, which are only exemplary and not intended to limit the scope of protection. The scope of protection is only limited by the appended claims.
Drawings
FIG. 1: a schematic view of a first embodiment of a cooling system with a refrigerant lubricated bearing assembly, an
FIG. 2: a schematic view of a second embodiment of a cooling system with a refrigerant lubricated bearing assembly.
In the following, elements of the same or similar function are indicated with the same reference numerals.
100 cooling system
10 cooling cycle
12 compressor unit
14 condenser unit
16 evaporator unit
20 lubrication cycle
22 lubrication refrigerant supply line
24 first filter unit
26 second filter unit
25 combination filter unit
28 third Filter Unit
Detailed Description
Fig. 1 and 2 show a schematic view of a cooling system 100, the cooling system 100 having a cooling cycle 10 and a lubrication cycle 20, wherein the lubrication cycle 20 further comprises a refrigerant as a lubricant.
A cooling system 100, such as a chiller (chiller) or an air conditioning system, typically includes a compressor unit 12, a condenser unit 14, and an evaporator unit 16 in a cooling cycle 10. Optionally, there is also an expansion unit (not shown), such as an expansion valve, upstream of the evaporator unit, which may be used to reduce the pressure of the refrigerant in the cooling cycle 10 upstream of the evaporator unit 16.
In the figures, the cooling cycle 10 is indicated by a thick arrow and works as follows: the compressor unit 12 compresses gaseous refrigerant, which may be directed to a condenser unit 14 for condensing the gaseous refrigerant to liquid refrigerant. The liquid refrigerant is then directed to an evaporator unit 16 for evaporating the liquid refrigerant to a gaseous refrigerant, and the refrigerant is then delivered back to the compressor unit 12 to provide compressed gaseous refrigerant.
The compressor unit 12 itself comprises a bearing assembly 2, the bearing assembly 2 having one or more rolling bearings. The bearing assembly 2 is only schematically shown in fig. 1. The bearing assembly 2 typically requires lubrication during operation. In order to simplify the design of the cooling system 100, it has recently been proposed to use a refrigerant not only in the cooling cycle 10 but also in the lubrication cycle 20 for lubricating the bearing assembly 2 by using the refrigerant as a lubricant for the bearing assembly 2. As a result, it has been proposed to branch off the lubrication refrigerant supply line 22 from the condenser unit 14 and supply the refrigerant as a lubricant to the bearing assembly 2.
Unfortunately, since the refrigerant also functions as a refrigerant in the cooling cycle 10, the refrigerant is exposed to several mechanical components (e.g., compressor, condenser, evaporator, connecting lines) and thus to heat and pressure and liquid and/or gaseous contaminants (e.g., air and moisture), which may trigger molecules in the refrigerant to possibly decompose and produce byproduct compounds that are harmful to the bearing assembly 2 used in the compressor unit 12. In addition, the decomposition of the molecules may even be caused by the inherent chemical instability (chemical instability) of the refrigerant itself. Furthermore, in case the refrigerant is used as a lubricant, particles may be present in the refrigerant which are detrimental to the bearing component 2, e.g. originating from wear or wear of mechanical components.
However, these byproducts and/or particles are very detrimental to the refrigerant lubricated bearing assembly as they may cause corrosion, increased wear, insufficient lubrication conditions, or cause other damage in the bearing assembly.
As a result, it has been proposed to arrange filter units 24, 26 and 28 in the lubrication refrigerant supply line 22 upstream of the bearing assembly 2. Thus, the filter unit(s) 24, 26, 28 contain materials that can adsorb or react with by-products, contaminants, and/or particulates, thereby removing particulates, acids, or water from the refrigerant.
The filter unit itself is preferably adapted to adsorb (/ absorb), intercept (/ acquire) (catch) or capture specific molecules from the refrigerant by mechanical, chemical and/or physical adsorption, wherein the type of adsorption/capture depends on the material type, the ambient composition (/ composition) and the expected contaminant type.
The most damaging by-products (byproducts) are therefore the highly corrosive (/ highly corrosive) acids (acids), in particular hydrofluoric acid (HF) and hydrochloric acid (HCl). Hydrofluoric acid and hydrochloric acid are formed from fluorine atoms and chlorine atoms contained in the refrigerant itself. Of particular interest are recently developed refrigerants, such as R1234ze, R1233zd, and R1234yf, that are formulated to readily decompose in the event they leak into the atmosphere, where they can potentially cause environmental problems. Thus, decomposition requires ensuring that the refrigerant does not deleteriously contaminate the environment. As a result, one of the filter units (e.g., the filter unit 24 in the embodiment shown in fig. 1) is an acid filter for filtering hydrofluoric acid (hydrofluoric acid) and/or hydrochloric acid (hydrochloric acid) from the refrigerant, wherein the filter material of the acid filter is from alumina (Al)2O3) Silicon dioxide (SiO)2) Graphite oxide, graphene oxide, magnesium oxide (MgO), aluminosilicate (/ aluminum silicate) (Al)2SiO5) And combinations thereof. These filter materials have proven successful in filtering hydrofluoric and/or hydrochloric acid. Therefore, preferably, aluminum or aluminum compounds are used for hydrofluoric acid, because the reaction product of aluminum and hydrofluoric acid is aluminum fluoride, which is a solid crystalline material that can be easily removed. For adsorption of hydrochloric acid, a filter comprising magnesium oxide is preferred, since the reaction products of the reaction of HCl and magnesium oxide are magnesium chloride and water.
In fig. 1, the second filter unit 26 is a desiccant filter for removing water (dissolved and/or free water) and/or moisture from the refrigerant. The filter material of the desiccant filter is generally hygroscopic and preferably selected from the group of Zeolite scavenger adsorbents (Zeolite Scavengersorbents) such as scolecites, natrolites, offretites, mazzite or combinations thereof having various sizes and shapes for filtering dissolved water, graphene oxide and combinations thereof, and polymers such as water absorbing filters for filtering free water. Water or rather moisture and humidity (/ humidity) has been considered another liquid contaminant that reacts with the refrigerant such that the refrigerant may decompose and produce byproducts that may corrode or diffuse into the bearing assembly. Thus, the combination of water, hydrofluoric acid, hydrochloric acid, and/or oxygen in the entrained air is a very harmful mixture that can cause severe damage to the bearing assembly.
In the illustrated embodiment of fig. 1, the third filter unit 28 is accordingly a particulate filter, which removes particles from the lubricating refrigerant, for example particles originating from wear or wear of mechanical components. These particles are detrimental to the surfaces of the bearing assembly, e.g. to the bearing rings or the rings (/ raceways) of the rolling elements, and may lead to increased wear and insufficient lubrication conditions in the bearing assembly 2.
In addition to the configuration of the filter units as shown in fig. 1, some or all of the filter units may be combined for reducing the overall required space or for using a synergistic effect. Such an embodiment is shown in fig. 2, wherein the filter unit 25 is a combination of an acid filter and a desiccant filter. Particularly preferably, because some of the adsorption reaction of the acid competes with the adsorption of water/moisture, or as mentioned above, the reaction product of the chemical reaction may be water, which also needs to be removed from the refrigerant.
In summary, by using a filter arrangement for filtering harmful substances from the lubricating refrigerant, a lubricating refrigerant substantially free of harmful components can be provided before the refrigerant is used to lubricate the bearing assembly. Thus, as the lubrication conditions of the bearing assembly are improved, the service life of the bearing assembly and the cooling system may be extended.

Claims (10)

1. A refrigerant lubricated bearing arrangement comprising: a bearing assembly lubricated by a refrigerant; a refrigerant supply line for supplying refrigerant as lubricant to the bearing assembly, wherein upstream of the bearing assembly the refrigerant supply line further comprises at least one filter unit for filtering refrigerant.
2. The bearing arrangement of claim 1 wherein the at least one filter unit comprises at least one of an acid filter, a desiccant filter and a particulate filter.
3. The bearing arrangement according to claim 1, wherein the at least one filter unit is a combined filter unit having at least an acid filter and a desiccant filter for filtering acid and moisture from the refrigerant.
4. The bearing arrangement according to claim 1, characterized in that the at least one filter unit is a filter arrangement with a plurality of filter elements, including an acid filter, a desiccant filter or a combination of an acid filter and a desiccant filter, and a particle filter, wherein the acid filter is arranged upstream of the desiccant filter and the particle filter, and the desiccant filter or a combination of an acid filter and a desiccant filter is arranged upstream of the particle filter.
5. The bearing arrangement according to claim 1, wherein the filter unit is adapted to adsorb, intercept or capture specific molecules from the refrigerant by chemisorption and/or physisorption.
6. The bearing arrangement according to claim 1, wherein the filter unit comprises an acid filter for filtering hydrofluoric acid and/or hydrochloric acid from the refrigerant, wherein the acid filter is ofThe filter material is made of alumina (Al)2O3) Silicon dioxide (SiO)2) Graphite oxide, graphene oxide, magnesium oxide (MgO), aluminosilicate (Al)2SiO5) And combinations thereof.
7. The bearing arrangement according to claim 1, wherein the filter unit comprises a desiccant filter for filtering dissolved and/or free water from the refrigerant, wherein a filter material of the desiccant filter is selected from the group of zeolite scavenger adsorbents such as scolecites, natrolites, offretites, ferrierites or combinations thereof having various sizes and shapes for filtering dissolved water, graphene oxide and combinations thereof and polymers such as water absorption filters for filtering free water.
8. The bearing arrangement according to claim 1, wherein the filter unit comprises a particle filter for filtering particles from the refrigerant, wherein preferably the particle filter is a stainless steel mesh, a magnet for metallic particles and/or a combination thereof.
9. A cooling system comprising a refrigerant circulation line for circulating refrigerant from at least one compressor unit for compressing gaseous refrigerant to a condenser unit for condensing gaseous refrigerant to liquid refrigerant, from the condenser unit to an expansion unit for expanding the liquid refrigerant, from the expansion unit to an evaporator unit for evaporating the liquid refrigerant to gaseous refrigerant, and from the evaporator unit back to the compressor unit, wherein the at least one compressor unit comprises a bearing arrangement according to any one of claims 1 to 8.
10. The cooling system according to claim 10, wherein the refrigerant supply line branches off from the refrigerant circulation line.
CN201911165596.XA 2018-11-27 2019-11-25 Refrigerant lubricated bearing arrangement Pending CN111219314A (en)

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US201862771625P 2018-11-27 2018-11-27
US62/771,625 2018-11-27

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CN201911165617.8A Pending CN111219899A (en) 2018-11-27 2019-11-25 Cooling system and method for operating a cooling system
CN202311181486.9A Pending CN117128654A (en) 2018-11-27 2019-11-25 Cooling system and method for operating a cooling system
CN201911180237.1A Active CN111219900B (en) 2018-11-27 2019-11-27 Cooling system and method for operating a cooling system

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CN202311181486.9A Pending CN117128654A (en) 2018-11-27 2019-11-25 Cooling system and method for operating a cooling system
CN201911180237.1A Active CN111219900B (en) 2018-11-27 2019-11-27 Cooling system and method for operating a cooling system

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CN113587506B (en) * 2021-07-26 2022-06-14 珠海格力电器股份有限公司 Refrigerant return-air system and refrigerating unit

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